If you are just searching for something cheap, and you don't care at all on what you sleep, then go for it.
First of all, the staff at joy's guesthouse were very friendly, they were able to accommodate us with a checkin at 4am! Very helpful and lovely people.
Now when it comes to the room it self. We could not sleep on the bed because we were so disgusted. The lines seemed like they have been left for month without cleaning. There was blood on our bedsheets, hair on the pillows. It was 4am when we got there so we were too tired to go anywhere. Luckily we had our camping gear. So we put our camping covers on the bed and slept on our camping pillows. We woke up early in the morning because there was no curtains, we were exhausted. It was by far my worst airbnb experience. I had booked the place for 2 nights, I cancelled the second night, I would never go there again!
But then again you will not find this kind of price around in Bangkok, so if you are not picky you can try it out by yourself! Good luck